arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0705.3655astro-phhep-ph
收藏

WMAP霾中暗物质湮灭的证据

Evidence Of Dark Matter Annihilations In The WMAP Haze

Dan Hooper, Douglas P. Finkbeiner, Gregory Dobler

摘要:

WMAP实验揭示了银河系中心周围区域的微波辐射过量。有人认为,这种被称为“WMAP烟雾”的信号可能是暗物质湮灭中产生的相对论电子和正电子的同步辐射。在这封信中,我们重新审视了这种可能性。我们发现,角分布的WMAP霾匹配暗物质湮灭的预测与尖点密度分布,$ρ(r) \propto r^{-1.2}$在内部千秒差距。在不同的WMAP频带的强度比较,我们发现,广泛的可能的WIMP湮没模式是一致的,与质量在100 GeV到多TeV范围内的WIMP的阴霾的光谱。最有趣的是,我们发现,为了产生观测到的霾强度,暗物质湮灭截面需要近似等于热遗迹所需的值,$σv \sim 3 \times 10^{-26}$ cm $^3$ /s。不需要增强因子。如果暗物质湮灭实际上是造成WMAP霾的原因,并且晕轮廓的斜率一直延伸到银河系内部,那么如果WIMP质量小于几百GeV,GLAST预计将探测到银河系中心暗物质湮灭产生的伽马射线。

英文摘要:

The WMAP experiment has revealed an excess of microwave emission from the region around the center of our Galaxy. It has been suggested that this signal, known as the ``WMAP Haze'', could be synchrotron emission from relativistic electrons and positrons generated in dark matter annihilations. In this letter, we revisit this possibility. We find that the angular distribution of the WMAP Haze matches the prediction for dark matter annihilations with a cusped density profile, $ρ(r) \propto r^{-1.2}$ in the inner kiloparsecs. Comparing the intensity in different WMAP frequency bands, we find that a wide range of possible WIMP annihilation modes are consistent with the spectrum of the haze for a WIMP with a mass in the 100 GeV to multi-TeV range. Most interestingly, we find that to generate the observed intensity of the haze, the dark matter annihilation cross section is required to be approximately equal to the value needed for a thermal relic, $σv \sim 3 \times 10^{-26}$ cm$^3$/s. No boost factors are required. If dark matter annihilations are in fact responsible for the WMAP Haze, and the slope of the halo profile continues into the inner Galaxy, GLAST is expected to detect gamma rays from the dark matter annihilations in the Galactic Center if the WIMP mass is less than several hundred GeV.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑